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> Sure, but that's 3 digits versus 1

It isn't, really. If asked about my approximate height, I'd say 'eins-achtzig' ie 1.8m (notice me omitting the unit), which in practice also has only a single significant digit (or 2 if you account for tall people) and to me isn't any more unwieldy than '6 foot'.

How about 5ft7 vs 170cm. The later seems easier to express to me. If only rough accuracy is required then you only really need to take note of the first two digits. Incidentally converting between the two is quite messy; first you must learn that 1ft = 12 inches, then multiply the 5 by 12 then add 7 then multiply by 2.54. Where as to convert a metric figure to imperial, it does not matter so much whether you are starting out in metres or centimetres.

Incidentally, I was raised metric-only in Germany and we would often say "I'm one head shorter/taller than X", which is close enough to a foot.